Help! Struggling to download new OS version

I have gone through multiple tutorials with opencore.

I tried to download Ventura however this didn't work as it requires El Capitan which I don't have. I can't access apple sites as I get an error code "can't establish a secure connection"

So I tried to download Monterey and when selecting it can't find a disk. I have a SanDisk usb in and I'm now lost.

Tempted to give up and get a new laptop but this one although old is great quality for a MacBook Air on OS X Yosemite.

Where to I go from here?

submitted by /u/TadpoleNo5042
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